Massive explosions of energy happening thousands of light-years from Earth may have left traces in our planet鈥檚 biology and geology, according to new research by 澳门开奖结果2023开奖记录 geoscientist Robert Brakenridge. The study, published this month in the International Journal of Astrobiology, probes the impacts of supernovas, some of the most violent events in the known universe. To study those possible impacts, Brakenridge searched through the planet鈥檚 tree ring records for the fingerprints of these distant, cosmic explosions. While not conclusive, his findings suggest that relatively close supernovas could theoretically have triggered at least four disruptions to Earth鈥檚 climate over the last 40,000 years.